title: An open letter on line extensions.
authors.affiliation: Canadian Pharmaceutical Association, Ottawa.
authors.forename: C
authors.initials: C
authors.lastname: Krogh
mesh_terms: D002170:Canada; D003257:Consumer Product Safety / Q000592:standards*; D004338:Drug Combinations; D004348:Drug Labeling / Q000592:standards*; D006801:Humans; D012957:Societies, Pharmaceutical
chemical_list: D004338:Drug Combinations